What's the plural form of mana-glut? Here's the word you're looking for.
Answer
The noun mana-glut can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be mana-glut.
However, in more specific contexts, the plural form can also be mana-gluts e.g. in reference to various types of mana-gluts
or a collection of mana-gluts.